Question

What is the correct expression for induced drag?

(a) \(\frac{ZW^2}{V^2_e}\)

(b) YVe^2

(c) \(\frac{ZW^2}{V_e}\)

(d) YVe

I had been asked this question in a job interview.

Question is taken from Minimum Drag Speed in portion Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

The correct option is (a) \(\frac{ZW^2}{V^2_e}\)

The explanation is: The correct expression for induced drag is \(\frac{ZW^2}{V^2_e}\) where W is weight, V is velocity, Z is constant. Induced drag is the function of lift and caused when an aircraft is moving in the air.